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Simplifying 8.1a + 13 = 85.9 Reorder the terms: 13 + 8.1a = 85.9 Solving 13 + 8.1a = 85.9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 8.1a = 85.9 + -13 Combine like terms: 13 + -13 = 0 0 + 8.1a = 85.9 + -13 8.1a = 85.9 + -13 Combine like terms: 85.9 + -13 = 72.9 8.1a = 72.9 Divide each side by '8.1'. a = 9 Simplifying a = 9
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